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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b36055e5b3d02fc31b63551366fe6c41d06f2bcdb1ba9b4acb348c1c05d9d89' 
  AND token = '093066kVrqZUQ4ADi+EzTsdgfn6qd8Hptzeo/Kbbr44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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