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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc9d94de050cffd4166386487d270d2b835b2a555bc97037386ec71fbe8a42df' 
  AND token = 'IURjNAo5e0imAQ9d9Os323437g4xqwrOuCi2yK/+mWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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