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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7628410872ed5d0bc5e9566dd1c71bdc7325391b32fc04281f481514e20942c' 
  AND token = 'MealEwCcwzxG0K4iRlgTxfLehjsPyKZzaovKx031a08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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