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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9fcd3ca6081a3a3fb4de9bf1bcc3d3688e25ee30dd77276526d13c6bfd0ae0cf' 
  AND token = 'ncY60Wx2L/aaSfzbgqoJmD4XFHr9D/eGAiV1W3I9qIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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