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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e6a588a84e0f5375ebb4be087c5b0dd4c37f2e29db3d5837e1ef0d6dd5fde20' 
  AND token = 'cK5kry7Pb3NtYFK6/kMW2mB2KQKNTjy0C3AgjLuoKXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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