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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c3233e59c40de345fadbe40ba96567885bbcbdab6f9ee06fa7122cbe1ea3630' 
  AND token = '59W+MImkjRox9Pden7cLacRQLQDSW5xxRpUN0XKjFP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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