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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee0094fa2be49e653723198250eb97ccdcf04e26c015309665a16f743861f849' 
  AND token = '7Ts3JwagfIcxYKWBmTT6Zp+6P0Zwy8IWqgIw7i9mN5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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