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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11f898c772a2078e3450c252da009f1f1a1105de1e38e7fec328c03a1385569c' 
  AND token = 'gt3psEqM/LkBrs+4Iz9sJTRkLmP0jXqcHbeWnqopJr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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