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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aeff81df73b3da247238d1eecf2fb112046f4e92588a82c3e15ee6ac29522064' 
  AND token = 'dERip9tZg0xKoDzJD7/xiqWDHPmweHFsXSXz/IQseL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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