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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37b31a68a27b535dcceecf026af9df27242ad5bce6b053a1402b5825fecdee5f' 
  AND token = '9wKOth5Q2VeUTY44EAiF+qR6/lwq/okH7j+K50+dXuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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