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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32c03e359feab55111c81937638b26d66d8e3307719f6858d63c62ba37560e81' 
  AND token = 'WFe7h7dM7+aNZ1cS2wmD2nN1zjZfGRhsjHnhHrD0JeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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