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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3e85ae4b7ef919f9cb663a2a15f1cdc3b589af3b4c9e1eb6128666194fd519a' 
  AND token = '4n66SK4hKeclqDy9M0bH/5elzHnYBfNzFS14z4/uUVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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