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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96eb099e842c57fc0a1e7ffe549b6e3e625649000733029314daaa89429ce5a5' 
  AND token = 'Tddflh4q2VfPSTAeFPXF2klFcsv5a+fNnDzXbsgcoxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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