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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '435f8cbbac7bf3bd3573827410b9d79ae51219f9eaa373912394f5bd56b00fd4' 
  AND token = '32KBZfZTRufyN9SDsMtAzMN2PXLtyBT/8U3CnwfmOVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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