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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96dea00f53ea8c25424174f0e89b63402a51e5a29437e30f8f70d9b3c1d1cd28' 
  AND token = '55gE4ig76huEXd4ARAArTdKECX0EiWBth07nuoVQUqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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