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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e300fa72667d774de038ac3fc8275b8d65a7f0ef1d07a154e90d15ae16d0768' 
  AND token = 'AcbgbMNFvkQ6Qc5pI9BsaDK4nHZB7BYdgXsIsKNmgPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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