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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '987ff34e9fa7eb02a7019c3ed86035b1da5496128d3323425f92bc9d84f4262a' 
  AND token = 'HmqC9P7iQHrGAxM5Cfm2doprSyHlndvYO1di5HtXMgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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