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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07b86e796ee8a1d314e2107010878baf0c58ea741fc6dea536f6a659758e7cb5' 
  AND token = '6Nn1++x82543gEWhXv1yfmAGOs4MyvS/mfKCAwExSOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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