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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e6ab3b53a93b6fb00a677e8576fb88e12089b85913f74905f05587ef7d623ef' 
  AND token = '7tWz3T+22m9s5n/3IZnhclPktKla53z222dI1J8ACQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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