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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1af6627e7f06f6d1fe6dc8b34796e9218abdb1f969cbddf7b0a55921116e8502' 
  AND token = '5T1jIBI8eu8LW8kC+c+J82ELLEhNwulCgyq9kUjHals=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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