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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '729ab87800e412c652a6e0b55421a68e7261ef3a010bc1143d4bea235cc254b7' 
  AND token = 'cwhSgknl8h+tEhDElibLu6Ot2Bf3oi/9yVcZVuT5QsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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