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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea0a2ba1020c71745c83bc0b3f508fbff2f81693de636cf22cc54142d5fb61bd' 
  AND token = 'QtTg2hSBqf0A6HLeqxoH2+3faBaFSFxbCd6Mao+rXDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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