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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '055949aa9f0c64c6c4a6d0bf4aa7545d57a1174dab89d240050e7d7a0cd91fd6' 
  AND token = 'rF/D3jgoIdSKZtMmkip/+R5bA7KxGJVRgIPhbLcWaeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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