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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca0496625bc8bd2132bb0ef683d1f0183348cfc2bec24685bc704f9a95d27784' 
  AND token = 'OO2KBvnD781zouPta5biVs8OlbqRjm7rS6yhwfJ0tsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}