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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94e83b82759d30675682629c68bd035dad135e8d3498afb7fc816759682f9fcf' 
  AND token = '0XnlL7kDOz3sG/NSjXKso6Ovu2H0lftV32rEkl5aDOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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