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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e1c56363af15116d033d6de37302488dffe69013c5e1d4d9c92c46814b1af81' 
  AND token = 'iQ2HdO480fiSkv9R4nrg6/UuITgi/AXM+PbDV/+kmi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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