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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3adfd0ab8d0d3825c91daa774b95ddb2398eaf5ccabe1987b0e7847b7cc97d5' 
  AND token = 'HJT0lgBK5ttBv01PbzFT2fFxlC57i8wy05YCprqhyPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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