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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fc5f620ae850460d4e44ee770ed3bd18d4c476916b13fce2b561b6bc30d7f28' 
  AND token = 'URXqUTQgdwAke4TjjEOgzzb3daWmB74TrfH79iCiVBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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