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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6c864c97158a392438f6aeb546a272872df87da55deb4688f33b8300e599650' 
  AND token = 'yniE7BbBJ0wrG6+dxamftxDrxRMX5EQpQiwo/DT6jtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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