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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70a8fa357fa8cdbc2eda9895e98844ca8ad23da9195ec59dd3cbddd30ce35f73' 
  AND token = 'FhWutsl/yQcc3z8BoUhSbk3I7XHGUkrKHDC5xRL4odU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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