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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb14b2a3820669ec99743189bb5ef60d4ac717ef0ea4b9fc46b7d180b653ae54' 
  AND token = 'fL2amGPiYw66FqF3dekieArnZHM3+h5Wx86iLrKAPNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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