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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a927e93c22b0d9cf286e82400aca60c97e1a344c5548447294b9ab92aa6bb3d' 
  AND token = 'SFdO0tlLfw9CZycfuB2MLFddCJjdc3IGvdjC38NNrdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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