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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6662923619dde12de4010021c9f84d1c774fba799cdf82a418927ebbfe8ba12a' 
  AND token = 'l0M/i7clXiv1Ur2kJfSgiUokMydx3wNCc61dHq9U97w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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