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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c230858c071ca017562b7d2190f0a8c6dfa44047e065f1a8cd1cc77d47ce2ec' 
  AND token = 'iKRJ3uiqYVQL2frthwkufbDeNT2z35Hc+/Pe9m+Fa0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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