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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d2e734c49630830ad259a4a9a7d3ec5ec6718651a295c13c66b68a2dcae041c' 
  AND token = 'aoobPmSuE5iw7xsMJRkSxiJbHuet4RUYQn+TijrqGko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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