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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94e5c92cb1ba3b18b8d8c188d4cb519017c5a79837e506772d0b55350c02a137' 
  AND token = 'MZvPQ0XXKSd7kjMsa7zibxFcNmmvkraJ6TSAXXmPH7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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