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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f6a6d59c3c74a36b27fae251bcf7be7b38a946023da5b92586d8da133429769' 
  AND token = 'mk4K7OJjTPcb/k6GMvgeGap/iMS6YO2Gtki9bdhVkSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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