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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acde69980f5f23ce77d8057c2400f53c5591061a7fe0496ed5a4926933e11e2a' 
  AND token = 'ecnS5yWlj2iz4yW6OfysTHVy9/RhLTUK0zAreYL+sUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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