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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6b383cf9fd9ed080f25486bdd9f8b2bba251e216a89b8ec69e61fa9b71b0f83' 
  AND token = 'aw19IGDnSHH0Ibx4blk1TSrKU+sXw7X81qWPEsbHzwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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