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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3de1d8ad919a8d2a785b0a1f14808dade26c536edcba06d6adc25ef61efa19bd' 
  AND token = 'TUzAExyw/hHvxlE0rkocBO6joUdsHT8alDxAWM3XoDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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