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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50b3b10657f45874030732269172878467335db60bfb30f67e89af43ac782b24' 
  AND token = 'n2BSsv9H6yI2RaGWMOokYU3YnWp1vbtyFFw0gd/Bkcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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