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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8f62e91bd459471660c9c1db7d244bd3e41ba286d6aeb21867f1371a3bc979e' 
  AND token = 'DR+oCApcNorhQ6Q8ksM6KL28E4yoUkQB33MmKXKla44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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